Rear bumper for an automobile



FIG. 1 is a front perspective view of a rear bumper for an automobile;

FIG. 2 is an enlarged front elevation view thereof;

FIG. 3 is an enlarged rear elevation view thereof;

FIG. 4 is an enlarged top plan view thereof;

FIG. 5 is an enlarged bottom plan view thereof; and

FIG. 6 is an enlarged left side elevation view thereof, the right side view thereof is a mirror image of the left side view. 

The ornamental design for a rear bumper for an automobile, as shown and described. 